{
  "non-ip" : "999.2.3.1",
  "Adaptors" : [
     {"device" : "ip01" , "gateway" : "192.168.0.1" , "net_mask" : "255.255.0.0" },
     {"device": "ip12", "network_ip_v4_address":["10.38.61.1","10.38.32.1"]}
  ]
}

jq -c '
def decend(p;f):
  . as $in
  | if type == "object" then
    reduce keys_unsorted[] as $key
( {}; . + { ($key) : ($in[$key] | decend($in;f)) } ) | f
elif type == "array" then map( decend($in;f) ) | f
elif (p | type) == "array" then .
else f
end;
decend(.;
   if type == "string" and
       test(
           "^(" +
           "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)" +
           "\\.){3}" +
           "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)" +
           "$")
   then [ . ] else . end)' infile

{
  "non-ip" : "999.2.3.1",
  "Adaptors" : [
      {"device" : "ip01", "gateway" : ["192.168.0.1"], "net_mask" : ["255.255.0.0"]},
      {"device" : "ip12", "network_ip_v4_address" : ["10.38.61.1", "10.38.32.1"]}
  ]
}